#507BCB
Closest named color: Windows Blue (#3778BF). oklch(59% 0.132 261.8), rgb(80, 123, 203).
Aa
Black text reads best on this color (5.03:1).
About this color
#507BCB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.132 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.032 away. Black text reads best on it, at 5.03:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.03:1 |
| White text | 4.16:1 |
Values
| HEX | #507BCB |
| RGB | rgb(80, 123, 203) |
| HSL | hsl(219, 54%, 55%) |
| OKLCH | oklch(59% 0.132 261.8) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #507BCB | 4.16:1 | AA large text | Lc -74.0 | Content text, not long reading |
| Black text on #507BCB | 5.03:1 | AA | Lc 35.6 | Non-text elements, placeholder text |
| #507BCB text on white | 4.16:1 | AA large text | Lc 68.5 | Content text, not long reading |
| #507BCB text on black | 5.03:1 | AA | Lc -33.1 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CDDAF0
oklch(88.5% 0.033 261)
-
Step 300
300
#ACC1E8
oklch(80.8% 0.06 262.8)
-
Step 400
400
#80A1DC
oklch(70.7% 0.094 261.7)
-
Step 500
500
#6088D3
oklch(63.1% 0.122 262.1)
-
Step 600
600 (this color)
#507BCB
oklch(59% 0.132 261.8)
-
Step 700
700
#385EA6
oklch(49.1% 0.123 261.9)
-
Step 800
800
#2F4D86
oklch(42.7% 0.101 262)
-
Step 900
900
#29416B
oklch(37.7% 0.078 260.9)
-
Step 950
950
#19263F
oklch(27% 0.05 262.6)
#507BCB with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #5882CE | 0.022 |
| Deuteranopia (no green cones) | #4777C9 | 0.016 |
| Tritanopia (no blue cones) | #008D99 | 0.113 |
| Achromatopsia (no color) | #7C7C7C | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #507BCB
#507BCB
oklch(59% 0.132 261.8)
- #A17400
#A17400
oklch(58.9% 0.121 81.5)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #507BCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.032
- Cool Blue #4984B8 ΔE 0.043
- Steel Blue #4682B4 ΔE 0.046
- Water Blue #0E87CC ΔE 0.047
- Dark Sky Blue #448EE4 ΔE 0.057
- Off Blue #5684AE ΔE 0.057
- Soft Blue #6488EA ΔE 0.061
- Flat Blue #3C73A8 ΔE 0.061
Use #507BCB in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.